文献类型：期刊文献

中文题名：Mechanistic insights into sequestration of U(VI) toward magnetic biochar: Batch, XPS and EXAFS techniques

英文题名：Mechanistic insights into sequestration of U(VI) toward magnetic biochar: Batch, XPS and EXAFS techniques

作者：Qingyuan Hu[1];Yuling Zhu[1];Baowei Hu[1];Songhua Lu[2];Guodong Sheng[1]

机构：[1]College of Life Science, College of Chemistry and Chemical Engineering, Shaoxing University;[2]Institute of Plasma Physics, Chinese Academy of Science

年份：2018

卷号：0

期号：8

起止页码：217

中文期刊名：环境科学学报：英文版

收录：CSTPCD、、Scopus、CSCD2017_2018、CSCD、PubMed

基金：supported by the National Natural Science Foundation of China (Nos. 21207092, 21577093);the Science and Technology Project of Shaoxing (No. 2014B70041)

语种：英文

中文关键词：Magnetic biochar;Uranium;X-ray absorption spectroscopy;Sequestration

外文关键词：Magnetic biochar;Uranium;X-ray absorption spectroscopy;Sequestration

中文摘要：The magnetic iron oxide(Fe_3O_4) nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe(II)-loaded hydrophyte biomass under N_2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity(54.35 mg/g)at pH 3.0 and 293 K. The reductive co-precipitation of U(VI) to U(IV) by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extended X-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental remediation.

外文摘要：The magnetic iron oxide（Fe3O4） nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe（II）-loaded hydrophyte biomass under N2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity（54.35 mg/g）at pH 3.0 and 293 K. The reductive co-precipitation of U（VI） to U（IV） by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extended X-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental remediation.